kcahmol'1)16 is slightly less stable than 3 (AH°= 74.6 kcal• mol-1)16 but certainly much more stable than 4 (AH°= 102.7 kcahmoL1). We consider it likely that lc is indeed formed on irradiation of 3 but that the photostationary state is even more unfavorable than in the case of 2b where 6-7% of 2b are in photoequilibrium with its Dewar isomer.5
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